I.5.4 Dyadic operators

Eight such operators have been defined. The meaning and behavior of the four elementary dyadic operations are explained first.

• “+” operator returns the union of two ResKeyLists.

• “-” operator returns the difference of two ResKeyLists.

• “*” operator returns the intersection of two ResKeyLists.

• “/” operator: if $x$ and $y$ are two ResKeyLists, then $x∕y=(x+y)-(x*y)$. (The operation is equivalent to a logical “exclusive or” operation on the entities.)